aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/gayle.c
blob: 3feaa26410be9b26eb30d4d52768324d3cff0294 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/*
 *  Amiga Gayle IDE Driver
 *
 *     Created 9 Jul 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <linux/zorro.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amigayle.h>


    /*
     *  Offsets from one of the above bases
     */

#define GAYLE_CONTROL	0x101a

    /*
     *  These are at different offsets from the base
     */

#define GAYLE_IRQ_4000	0xdd3020	/* MSB = 1, Harddisk is source of */
#define GAYLE_IRQ_1200	0xda9000	/* interrupt */


    /*
     *  Offset of the secondary port for IDE doublers
     *  Note that GAYLE_CONTROL is NOT available then!
     */

#define GAYLE_NEXT_PORT	0x1000

#define GAYLE_NUM_HWIFS		2
#define GAYLE_NUM_PROBE_HWIFS	(ide_doubler ? GAYLE_NUM_HWIFS : \
					       GAYLE_NUM_HWIFS-1)
#define GAYLE_HAS_CONTROL_REG	(!ide_doubler)

static int ide_doubler;
module_param_named(doubler, ide_doubler, bool, 0);
MODULE_PARM_DESC(doubler, "enable support for IDE doublers");

    /*
     *  Check and acknowledge the interrupt status
     */

static int gayle_test_irq(ide_hwif_t *hwif)
{
	unsigned char ch;

	ch = z_readb(hwif->io_ports.irq_addr);
	if (!(ch & GAYLE_IRQ_IDE))
		return 0;
	return 1;
}

static void gayle_a1200_clear_irq(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;

	(void)z_readb(hwif->io_ports.status_addr);
	z_writeb(0x7c, hwif->io_ports.irq_addr);
}

static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base,
				     unsigned long ctl, unsigned long irq_port)
{
	int i;

	memset(hw, 0, sizeof(*hw));

	hw->io_ports.data_addr = base;

	for (i = 1; i < 8; i++)
		hw->io_ports_array[i] = base + 2 + i * 4;

	hw->io_ports.ctl_addr = ctl;
	hw->io_ports.irq_addr = irq_port;

	hw->irq = IRQ_AMIGA_PORTS;
}

static const struct ide_port_ops gayle_a4000_port_ops = {
	.test_irq		= gayle_test_irq,
};

static const struct ide_port_ops gayle_a1200_port_ops = {
	.clear_irq		= gayle_a1200_clear_irq,
	.test_irq		= gayle_test_irq,
};

static const struct ide_port_info gayle_port_info = {
	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
				  IDE_HFLAG_NO_DMA,
	.irq_flags		= IRQF_SHARED,
	.chipset		= ide_generic,
};

    /*
     *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
     */

static int __init amiga_gayle_ide_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct gayle_ide_platform_data *pdata;
	unsigned long base, ctrlport, irqport;
	unsigned int i;
	int error;
	struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS];
	struct ide_port_info d = gayle_port_info;
	struct ide_host *host;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	if (!request_mem_region(res->start, resource_size(res), "IDE"))
		return -EBUSY;

	pdata = pdev->dev.platform_data;
	pr_info("ide: Gayle IDE controller (A%u style%s)\n",
		pdata->explicit_ack ? 1200 : 4000,
		ide_doubler ? ", IDE doubler" : "");

	base = (unsigned long)ZTWO_VADDR(pdata->base);
	ctrlport = 0;
	irqport = (unsigned long)ZTWO_VADDR(pdata->irqport);
	if (pdata->explicit_ack)
		d.port_ops = &gayle_a1200_port_ops;
	else
		d.port_ops = &gayle_a4000_port_ops;

	for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++, base += GAYLE_NEXT_PORT) {
		if (GAYLE_HAS_CONTROL_REG)
			ctrlport = base + GAYLE_CONTROL;

		gayle_setup_ports(&hw[i], base, ctrlport, irqport);
		hws[i] = &hw[i];
	}

	error = ide_host_add(&d, hws, i, &host);
	if (error)
		goto out;

	platform_set_drvdata(pdev, host);
	return 0;

out:
	release_mem_region(res->start, resource_size(res));
	return error;
}

static int __exit amiga_gayle_ide_remove(struct platform_device *pdev)
{
	struct ide_host *host = platform_get_drvdata(pdev);
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	ide_host_remove(host);
	release_mem_region(res->start, resource_size(res));
	return 0;
}

static struct platform_driver amiga_gayle_ide_driver = {
	.remove = __exit_p(amiga_gayle_ide_remove),
	.driver   = {
		.name	= "amiga-gayle-ide",
		.owner	= THIS_MODULE,
	},
};

static int __init amiga_gayle_ide_init(void)
{
	return platform_driver_probe(&amiga_gayle_ide_driver,
				     amiga_gayle_ide_probe);
}

module_init(amiga_gayle_ide_init);

static void __exit amiga_gayle_ide_exit(void)
{
	platform_driver_unregister(&amiga_gayle_ide_driver);
}

module_exit(amiga_gayle_ide_exit);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:amiga-gayle-ide");